Floor-slab.



No. 872,726. PATENTED DEC. 3, 1907. I

C. B. GRADY. FLOORSLAB.

AFPLwMIoN FILED Nov.1e, 1906. l

' magma-.SHEET z.

gral with) the girders of theslab.

assed through all of the openings aforesaid. eloW each of said rods, I pass other rods N through openings in the several pairs of bentup ends f, g, h and 7', to further strengthen the structure.

ened means of rods M disposed between the pair ci girders, and by rods L outside of the said girders. Av skeleton or frame, made up as aforesaid, is 'then suitably held or disposed, and a mass of concrete is poured or forced around said frame, and when han dened and in finished condition,'the whole constitutes a llooreslab of the kind shown in Fig. 1. A

Particularly referring to Fig. 4, it will be seen that a considerablepart of the hangers C (via, the bent-up ends of the longest plates E ol' the girders) are free of cement. To secure a Afloor-slab in place, it is lowered between the opposite Vlloor-girders, I), (secured to and supported by columns It) and secured to saddles O, straddling said girders, thereby attaining a suspension of the floorslab directly upon the lloorgirders, and at points directly in line with (in reality in-te As` betere stated, the preferred forml ol floor-slab has bars D projecting from opposite side edges, and these bars are employed for the purpose of securing together successive licor-slabs. Near the ends of the bars, holes d3 (Fig 2) provided, and the ends of adjacent bars are disposed side by side-(as shown between the slabs A and A1), and bolts or rivets d are passed through the alined openings of adjacent rod-ends. Additional strengthening pieces may be applied to the rod-ends, and, for this purpose, short bars, df (lying close to `the ends of bars I) and secured in place by the rods K and L) may be used. The positions of such strengthening pieces aswell as of the various rods L and M, will be seen by-rel`erring to the slab A1 of Fig. 3. I floor-slabs may be iilled, in any Way, by concrete, as shown at V between slabs A2 and A3, and the space between the ends of the slabs and the floor-girders, as well as spaces neces-v sary to level the floor, may be filled with concrete.` For thispurpose, a trough or box I In addition, the bars D are tied together and the entire frame strength-V The space U between successive arenas and a top board S, above and below the iioorgirder will hold the concrete, until hardened,

in the space between the ends of the oorl slabs and the iloor-girders. v

What I claim is:

1. In a hoor-slab, a mass of hardened con crete formed about a metallic frame provided with a pair of strengthening girders each comprising a plurality of ysuperimposed plates secured together Where superimposed and with their ends bent upwardly," i-barsil passing through the. hardened concrete' mass, contacting with the sides of the upwardlybent ends of such lates-and projecting from' the side edges cip the concrete mass, andY means engaging-With boththe saidfbars -and the plate-ends. Y 2. In a hoor-slab, a mass of hardened concrete formed about'a metallic frame provided with separate strengthening girders'- each comprising apluralit of plates conl ing upwardly `bent ends, bars passin through the' hardened concrete massi anv projecting from the side edges of said vInass and means for securing each of saidbarsinto comprising aplurality of plates connected' together and each-otl said plates having'vu wardIyLbent ends, bars passing through t e,

hardened concrete mass, contacting with the nected together and each'o said plates havg engagement with one upwardly-bent plate sides of the upwardly-bent lends" of such plates and projecting'irom the side edges 6% the concrete mass,V and rods eachof which extends lengthwise of -a vgirderA and vpasse/s through openings in all of the upwardly-bent. plate-ends of such girder and through open# ings in all of the bars contacting with lthe sides lof such plate-ends.

In witness whereof, I have signed my name to this speciiication 1n the presence of two subscribing witnesses.

CHARLES B-nnnnrcr GRADY. 

